Broadband Anisotropic Optical Properties of the Terahertz Generator HMQ-TMS Organic Crystal

D’Arco, Annalisa; Tomarchio, Luca; Dolci, Valerio; Pietro, P. Di; Perucchi, A.; Mou, Sen; Petrarca, M.; Lupi, S.

doi:10.3390/condmat5030047

Cited by 16 publications

(6 citation statements)

References 47 publications

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“…It was revealed that different physical processes-photocurrent surge effect due to the strong surface electric field induced band bending, the so-called photo-Dember effect, because of the spatial separation of the electrons and the holes due to their different mobilities, resulting in appearance of the electric field, second-order or the third-order susceptibilityrelated optical rectification or electrical field-induced optical rectification, respectively-can be found as responsible THz emission mechanisms in various semiconductors, such as radiation-damaged silicon-on-sapphire and low-temperature-grown, or ion-implanted GaAs, InGaAs, InAs, or GaAsBi semiconducting compounds [19]. Regarding investigated materials, one can note that the studies were not limited to semiconductors only; a special attention gained optical rectification-based THz emission from lithium niobate [20,21] and second-order nonlinear effects for THz generation in different type of organic crystals, like DAST, DSTMS, OH1, HMQ-TMS, and BNA [22][23][24][25][26]. It is worth noting air-plasma-based THz photonics approach when a high intensity femtosecond laser can induce plasma oscillations in air [27,28], which can emit broadband THz radiation [29,30].…”

Section: Compact Solutions In Thz Emittersmentioning

confidence: 99%

Roadmap of Terahertz Imaging 2021

Valušis

Lisauskas

Yuan

et al. 2021

Sensors

191

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In this roadmap article, we have focused on the most recent advances in terahertz (THz) imaging with particular attention paid to the optimization and miniaturization of the THz imaging systems. Such systems entail enhanced functionality, reduced power consumption, and increased convenience, thus being geared toward the implementation of THz imaging systems in real operational conditions. The article will touch upon the advanced solid-state-based THz imaging systems, including room temperature THz sensors and arrays, as well as their on-chip integration with diffractive THz optical components. We will cover the current-state of compact room temperature THz emission sources, both optolectronic and electrically driven; particular emphasis is attributed to the beam-forming role in THz imaging, THz holography and spatial filtering, THz nano-imaging, and computational imaging. A number of advanced THz techniques, such as light-field THz imaging, homodyne spectroscopy, and phase sensitive spectrometry, THz modulated continuous wave imaging, room temperature THz frequency combs, and passive THz imaging, as well as the use of artificial intelligence in THz data processing and optics development, will be reviewed. This roadmap presents a structured snapshot of current advances in THz imaging as of 2021 and provides an opinion on contemporary scientific and technological challenges in this field, as well as extrapolations of possible further evolution in THz imaging.

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Section: Compact Solutions In Thz Emittersmentioning

confidence: 99%

Roadmap of Terahertz Imaging 2021

Valušis

Lisauskas

Yuan

et al. 2021

Sensors

191

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“…Design strategies have been also discussed and some examples have been presented and analyzed. D'Arco et al, in their contribution [21] measured the complex refraction index of one HMQ-TMS (2-(4-hydroxy-3-methoxystyryl)-1-methylquinolinium 2,4,6-trimethyl benzenesulfonate) single crystal from THz to UV, observing a remarkable anisotropy, strongly attenuated at long wavelengths. The HMQ-TMS is a recently discovered anisotropic organic crystal that can be exploited for the production of broadband high-intensity THz radiation through the optical rectification technique.…”

Section: Discussionmentioning

confidence: 99%

Terahertz as a Frontier Area for Science and Technology

2021

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Recent theoretical and experimental research is triggering interest to technologies based on radiation in the region from ~0.1 to 20 Terahertz (THz). Today, this region of the electromagnetic (e.m.) spectrum is a frontier area for research in many disciplines. The technological roadmap of the THz radiation considers outdoor and indoor communications, security, drug detection, biometrics, food quality control, agriculture, medicine, semiconductors, and air pollution, and demands high-power and sub-ps compact sources, modern detectors, and new integrated systems. There are still many open questions regarding working at THz frequencies and with THz radiation. In particular, we need to invest in new methodologies and in materials exhibiting the unusual or exotic properties of THz. This book contains original papers dealing with some emerging THz applications, new devices, sources and detectors, and materials with advanced properties for applications in biomedicine, cultural heritage, technology, and space.

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“…In the last two decades, many efforts have been made to improve THz technology, e.g., THz sources and detectors [56][57][58][59][60][61][62][63][64][65][66][67][68][69], discovering new materials with strong THz response [70][71][72][73] and new customizable, flexible and compact devices for spectroscopy [74].…”

Section: Thz Technology For Protein Spectroscopymentioning

confidence: 99%

Terahertz Spectroscopic Analysis in Protein Dynamics: Current Status

et al. 2022

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Proteins play a key role in living organisms. The study of proteins and their dynamics provides information about their functionality, catalysis and potential alterations towards pathological diseases. Several techniques are used for studying protein dynamics, e.g., magnetic resonance, fluorescence imaging techniques, mid-infrared spectroscopy and biochemical assays. Spectroscopic analysis, based on the use of terahertz (THz) radiation with frequencies between 0.1 and 15 THz (3–500 cm−1), was underestimated by the biochemical community. In recent years, however, the potential of THz spectroscopy in the analysis of both simple structures, such as polypeptide molecules, and complex structures, such as protein complexes, has been demonstrated. The THz absorption spectrum provides some information on proteins: for small molecules the THz spectrum is dominated by individual modes related to the presence of hydrogen bonds. For peptides, the spectral information concerns their secondary structure, while for complex proteins such as globular proteins and viral glycoproteins, spectra also provide information on collective modes. In this short review, we discuss the results obtained by THz spectroscopy in the protein dynamics investigations. In particular, we will illustrate advantages and applications of THz spectroscopy, pointing out the complementary information it may provide.

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Broadband Anisotropic Optical Properties of the Terahertz Generator HMQ-TMS Organic Crystal

Cited by 16 publications

References 47 publications

Roadmap of Terahertz Imaging 2021

Roadmap of Terahertz Imaging 2021

Terahertz as a Frontier Area for Science and Technology

Terahertz Spectroscopic Analysis in Protein Dynamics: Current Status

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